Abstract
Optical phase conjugation (OPC) of a polarization-multiplexed comb of 10x114Gb/s DP-QPSK signals has been demonstrated for the first time, occupying a spectral bandwidth of >1 THz (~9 nm). The nonlinear element employed for the OPC was highly nonlinear fiber (HNLF) optimized for the suppression of stimulated Brillouin scattering (SBS) and configured in a bi-directional loop offering polarization diversity. Pump power (each way about the loop) and input signal power to the OPC subsystem were optimized at 29.7 dBm and + 3 dBm respectively producing a Q(2) penalty of ≤ 0.9 dB over all conjugate wavelengths, polarizations and output OSNR (up to 20 dB).
Highlights
Optical phase conjugation (OPC) is a well-known process whereby an optical signal is propagated through a nonlinear medium in the presence of a pump beam to create a ‘phase conjugate’ signal, typically at a shifted frequency/energy
OPC via mid-span spectral inversion (MSSI) offers the prospect of nonlinear compensation [10], and with coherent detection and DSP algorithms commonly compensating for chromatic dispersion (CD) and other linear transmission impairments, OPC is being re-examined as a potentially efficient technique for parallel compensation of multichannel nonlinearities such as cross-phase modulation (XPM) [11]
Polarization-diverse optical phase conjugation of 10 x 114Gb/s 100GHz-spaced DP-QPSK signals with coherent detection was demonstrated and characterized for the first time using highly nonlinear fiber (HNLF) arranged in a bi-directional loop configuration
Summary
Optical phase conjugation (OPC) is a well-known process whereby an optical signal is propagated through a nonlinear medium in the presence of a pump beam to create a ‘phase conjugate’ signal, typically at a shifted frequency/energy. Polarization diverse OPC has been demonstrated in numerous ways, but typically with the common factor of creating orthogonal pump components which subsequently interact with the relevant component of the signal having a parallel polarization at a particular moment in time. This can be achieved in various ways by e.g. using two discrete orthogonal pumps [15], placing the nonlinear element in a loop with counter-propagating orthogonal pump/signal polarizations [6, 7, 11] or by employing a reflective Faraday rotator [9]. We report here an OPC capable of conjugating >1THz (~9nm) optical bandwidth and for the first time demonstrate conjugation of a 1.14Tb/s (10x114Gb/s) multiplex of DP-QPSK signals
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